What are the types of fastener sealing?

Kazzari Seal

Kazzari seal: This is a forced seal, which has three forms: externally threaded internally sealed, internally threaded internally sealed, and modified internally sealed. Among them, the external thread clamp is most used for internal sealing. Its gasket is a soft metal gasket with a triangular cross section, which is made of copper or aluminum. The cylinder flange and the end cover of the container are connected by a threaded sleeve, and the compression ring is tightened by tightening the compression bolt to increase the force and the gasket is compressed to achieve the seal. The advantage of this structure is that the connecting bolts between the end of the cylinder and the end cover are omitted, and it is easy to disassemble. It belongs to a quick-release structure; the area of ​​the gasket can also be relatively large, so the required pressing force and the diameter of the pressing bolt are also Relatively large; reliable sealing, suitable for containers with relatively small temperature fluctuations. However, the structure is complicated, the sealing parts are redundant, and the precision requirements are low, and the processing is difficult. This kind of container structure is often used for small diameter and high pressure, and it needs to be assembled and disassembled frequently. The function principle of the internal thread of the pressure vessel that requires slow opening is basically the same as that of the external thread. The only difference is that the threaded end cap is indirectly screwed. Into the end of the cylinder with internal threads. The sealing gasket is placed at the junction of the end cover and the end of the cylinder, and there is a compression ring on it. Through the compression bolts, the inner side and the bottom of the sealing gasket are in sequence with the end of the end cap and the end of the cylinder. Achieve sealing. It is higher than the external thread clip and saves a slightly easier-to-process threaded sleeve, and the structure is more intuitive, but its end cap needs to be thickened, occupying more pressure space, and the thread is not easily corroded by the medium. Assembly and disassembly It is also inconvenient and has few working conditions. Usually only used on high-pressure vessels with large diameters.
The inner sealing structure of the improved clip does not require a threaded sleeve to connect the end cover and the cylinder, so the bolt connection is used instead, and the others are similar to the inner seal of the external thread clip. There are no obvious advantages, so it is very difficult to use.

Flat gasket
The flat gasket seal is a mandatory seal. A soft material or metal gasket is placed between the connecting surfaces. Under the action of the bolt pre-tightening force, the unevenness of the contact surface (that is, the gap or the hole where the medium may leak) ), it is filled with the gasket material that is plastically deformed after being squeezed, thus achieving the purpose of the container.
In order to improve the sealing performance, 1 to 2 triangular cross-section grooves can be opened on the sealing seat joint surface, the groove is shallow, the groove width is 1mm each, and the center of the two grooves is 5mm apart. This type of container is usually only used for small and medium-sized high-pressure containers whose temperature is never low. Its structure is intuitive, and the seal is reliable when the diameter is large and the pressure is never low. It is difficult to process the gasket and the sealing seat joint surface. It has more experience in use and is relatively mature. However, small diameter, low pressure, low temperature (over 200℃) or relatively small temperature and pressure fluctuations require relatively small bolt pre-tightening force and less sealing performance. Because the bolt load is proportional to the pressure of the medium and the area of ​​the gasket. Therefore, the pressure is low, the inner diameter of the equipment is small, the bolt size is small, and the flange and the top cover are increased in size, making the structure light and easy to install and unload.